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72/80 DISEDERHANAKAN MENJADI 9/10
MAKA 9*30/10
= 27 HARI
dik : a=72 ekor ; b=72+8 ekor ; hari1=30 hari ; hari2=x?
jawab :
a | b = hari2 | hari1
72 | 80 = x | 30 (dikali silang)
x . 80 = 72 . 30
80x = 2160
x = 27 hari